Stair structure



J. AMANN STAIR STRUCTURE Aug. 9, i932.

Filed April 8, 1951 /A/l//SA/ro JOHN HMA/wv. 5)/ ,49M

Patented Aug. 9, 1932 JOHN AMANN, F ST. LOUIS, MISSOURI STAIR STRUCTUREApplication led April 8, 1931.

This invention relates to stair structures, and more particularly to astair structure built of metal and concrete.

The primary obj ect of this invention is the development of a metal andconcrete stair structure whereby the metal portion of the structureconstitutes a complete, practical and serviceable stairway, which can beused during the process of construction of a building,

lo so that a temporary stairway is not necessary, nor is it necessary toprovide temporary treads; and, which also provides a metal nosing thatslidably interlocks with the metal tread when the concrete is poured, sothat '1,5 when the concrete is poured, the nosing forms a completeprotection to the front upper corner and face of the concrete.

A further object of this invention is to provide a metal nosing which isfirmly and rigid- '20 llylheld in place without the use of rivets or ots.

A still further object of this invention is to provide a combined metaltread and riser that interloclrs with the adjacent metal treads andrisers without the use of bolts or rivets.

Other objects and yadvantages of this invention will be apparent fromthe specification, claims and drawing, in which Fig. l is a sideelevation of a section of my '30 improved stair structure.

Fig. 2 is an enlarged side view of a section of my improved stairstructure, showing a preferred method of interlocking the nosepiece.

Fig. 3 is a front view of my improved stair structure.

Fig. l is a bottom view of an interlocking slot through the sub-tread.

Fig. 5 is a modified form of the slot shown in Fig. 4.

F ig. 6 is a view of the nosepiece being interlocked with the sub-tread.

Fig. 7 is a side view showing a modified form of locking the nose-piecein place.

Fig. 8 is another modification of the slot shown in Fig. 4.

In the construction of new buildings, it is very desirable andadvantageous to have the stairways built simultaneously with theerection of the walls, partitions, floors, etc., in

Serial No. 528,588.

order that they may be used by workmen and for the handling ofmaterials. Where the nose-piece is permanently attached at the factoryto the front edge of the step, it is necessary to build up the step withboards during the process of constructing the building, and even in thiscase, the nose-piece is frequently deformed and injured, as well asproviding an extra. hazard to Workmen passing up and down.

To avoid this difficulty and to protectthe steps against damage, theconstruction herein described has been devised.

My preferred method of construction provides metal stringers l to whichthe steps are rigidly attached by bolts or rivets, or other suitablefastening means neither shown or claimed herein. The risers 2,preferably made of sheet metal, are integral with the 4 sub-tread 3,which is turned upwardly at right angles, as indicated at 4 to form botha protection for the rear side of the concrete step and to form aninterlocking member or hook 5, which engages a similar hook 6 on thelower end of the nent` above adjacent riser 2, so that the steps arerigidly held in place and held together without the use of bolts orrivets.

Near the front edge of the sub-tread 3, a perforation 7 is provided,which may take the form of a quadrangular slotas shown at 8 in Fig.5,'or it may be a quadrangular slot in which the metal is severed onthree sides and pressed downward to form a lip 9, as shown in Fig. 8;or, it may take the form of two circles of different diameters joinedtogether as indicated by l() in Fig. 8; or any other form desired thatwill perform the function of interlocking with a slidable nose-piece l1.

As illustrated in Fig. 2, the nose-piece is designed to protect thefront edge of the concrete step and its upper end is turned inwardly atkright angles so as to form a protecting met-al edge upon the frontupper marginal edges of the step or con-crete tread.

The lower portion 12 of the nose-piece is turned inwardly at rightangles and is provided with an opening 13 near its inner end adapted toregister with the perforation 7 in the sub-tread when the nose-piece 11is moved inwardly before the concrete is poured.

Through the perforations 7 and 13, a locking member 14 is provided of ashape somewhat like an. inverted Z. hen the noscpiece 11 is movedinwardly, so that the slots 7 and 13 register, the locking member 14 1sinsertedv and'then-thefnose-piece isslided out wardlyuntil the inner endof the nosepieee lies beneath the upper end of thelocking member 14. Y

A modified form of "the `vsame 'locking method consists of a perforation10,shown.

in Fig. 8, near the front edge of the subtread and a locking member 15Ycylindricalin form and having a shoulder 16 and a head17,"which`isfinserted through the largervdiametervof the perforation10and thenslidablyumovedoutward sothat the shoulder :16 engages thesmaller diameter of the perfo.- ration 10.

It .is obviousthat various other forms of locking members and,pcrforations could be used'to carry out the same purpose. When thelnose-piece V11 lis put into posi- Y tion, the sub-tread 3, thenose-piece 1.1 and the upwardly turned rear portion of theLsubtreadprovide y'a form vinto which concrete is poured, the endsbeingclosedby'the stringers 11.

Anothermodiiied form of nose-piece, not `shownzin the drawing,wouldconsisteofrbending "the longer leg ofsnose-piece `downwardly f 'so astoiorm'a lock to engagerthe. slotted portion; 9, shown` in rFi'g.v 4.

1t istofbe observed 'that in each one locking means shown or describedfitfis nec- 'essarythatthe nose-piecebe movedinwardly 'and thengslidablywithdrawn Lfonward until the; locking members properly engage, and whenthe concrete is poured and sets the lockingimem'bers are firmly 'hel'iin place andithe `nosepiece is held rigidly against the -front side ofthe concrete step. Therefore, applicant Wishesy it understood that.hedoes not 'confine himself te either othelockingmeans hereinl'shown,but'rintends to claimf any inter'- locking means for the nose-pieceandyfor-fthe connection the vsub-tread vwith the riser that f involves a fsliding' movement r to f engage `Athem.

Having fully described my inventiomwhat claim as newand usefuly anddesire'toprotectibyLettersL Patent is:

' 1'. Astair structurefof the classv described, `comprising sidestringers,.metal step treads .cnmprising vat nhtangles Yinwar.saidsub-treadhaving itsr front marginal edge turned downwardly altrightangles and terminating with an inwardly turned hook, thereby'toform ariser for the next below adjacent step, said last-named hook beingadapted 5to interlock with said first-named hook'y of' the next belowadjacent step, a slotted curvilinear nose-piece slidably interlockablewith a companion slotfin said sub-tread,

a concrete upper tread superimposed upon '90 said sub-tread adapted tohold said nose- `piece permanently in locked position.

3. A'stair'stru'cture of the class described, compri singfmetal sidestringers, integralsubtreads?.andrisers slotted to receive one end ofval1-interlocking Amember, an 'independent y interlocking member adaptedto slidably oin ksaid integral sub-treads andy risers with nextadjacentrsub-treads and, risers, a metalnoseypiece slidabl-yinterlockabl'e with said metal sub-treads,v a lockablemember adapted toslidablyinterlock said nose-piece and said slib-tread, 'aA concretetread superimposed `upon said metal sub-tread, yhaving its front and itsupper front edge protectedby said metalV nose-'piece andfhaving its rearand-'its upper marginal edge protected by the upturned portion of saidmetal tread.

In testimony whereof I have hereunto affixed my signature this 20th dayof March,

J CHN AMANN.

slotted near theirfefront edges, `curvilinear 'members adapted to. coverthe front and"A top marginal edges ofia concrete'vtrea'dvsuperimposed'upon said metal'trealds, saidcurvilinear membershavingtheir lower ends slotted f 'and turnedV atrightangles tothe vertical, so

that theV Vslot in.'A said curvilinear member regfisterszwithiheslotinfsaid'tread, a curvilinearzlockingimember f adapted 'to engage theSlat in: said rcurvilinear member-"at one end

